OrthO tribunE | OctObEr 2009 industry clinical & Products 13 EasyFit Jumper FORESTADENT introduces a fixed functional orthodontic appliance for the protrusive movement of the mandible with its new EasyFit™ Jumper. This modified Herbst appliance is attached in the maxilla within the molar area (between teeth #5 and #7) and in the mandibular within the premolar area (teeth #3 and #5), similar to the well-known mandibular protrusion hinge by Prof. Dr. Herbst. The EasyFit Jumper is not attached to bands or splints but placed directly on the archwire of the multibracket appliance. It is fixed in position using special nuts with integrated rectangular tubes that are simply slipped onto the archwire to be fitted, adjusted and clamped using pliers. important to remember the mandibular condylar cartilage, as all cartilages, does not contain blood vessels and receives its nutrients and growth factors through its surrounding structures.) This repetitive stimulation every night, maintaining the mandible in an edge-to-edge position, induces new muscular fiber formation in the muscles protruding the mandible and improves the activity in those muscles. This allows the mandible to be kept in a forward position without muscular tiredness due to lactic acid accumulation. In other words, the mandible is now in a forward position held by the muscles. On the other hand, this muscular hyper-contractibility, occurring in the muscles protruding the mandible the moment the appliance is removed from the mouth, stimulates endochondral ossification, which leads to more mandibular development. These effects together bring the mandible forward through an increase in the performance of the muscles protruding the mandible and endochondral ossification. This explains the significant clinical results presented in Figure 3, and those reported in the literature where a significant improvement in the relationship between the maxilla and the mandible was observed in patients Class II, division 1 and 2 when treatment was performed with the TRAINER System Appliances (Quadrelli, et al. 2002; Usumez et al. 2004; Ramirez-Yañez and Faria 2008). OT Look for Part 3 of this article in the November issue of Ortho Tribune. References will appear at the end of Part 3. er, which operates without spacers. Instead, the thread construction in the guide tube ensures smooth adjustment of mandibular advancement. The key supplied is simply inserted into the hole of the sleeve on the guide tube and turned in the required direction until the planned protrusion is reached. There is no longer the need for time-consuming laboratory procedures or several appointments for individual adjustments of the appliance. All working stages can now be performed directly at chairside in one appointment. The appliance can also be easily reactivated intraorally. The dorsal angulation bar of the Class II device automatically produces a horizontal movement, which is parallel to the occlusal plane. Applied forces can therefore be channeled to a favorable direction on the square archwire and multibracket appliance. The intelligent design of the EasyFit Jumper also enables left-handed or right-handed activation without having to alter the position of the patient. Furthermore, the unique construction eliminates the risk of accidental aspiration of loose parts. Forestadent USA 2315 Weldon Parkway St. Louis, Mo. 63146 Phone: (800) 721-4940 or (314) 878-5985 Fax: (314) 878-7604 E-mail: info@forestadentusa.com www.forestadentusa.com AD The majority of Class II appliances have to be disassembled several times due to the use of spacers, but this is not necessary with the Easy-Fit Jump- OT About the author Dr. German Ramirez-Yañez, DDS, MDSc, PhD, is an assistant professor on the faculty of dentistry, Department of Preventive Dental Science at the University of Manitoba in Winnipeg, Canada. Contact him at german@myoresearch.com.